Vehicle roller jack



v-EHmLE' ROLLER'v JACK?. APPL'ICATSON EILEDSEIT. 5, 1919..

Pat'nte; Dec.

NNN mw NNN m WHMMM f oww 'LL MIZEP AND V'. mms;

VEHICLE ROLLER JACK.

APPLICATION FILED SEPT. 5. 191s.

Mmm DEC. 591922,

4 SHEETS- SHEET 2.

Patented Dec. 5.1922.

1.1. VHZER AND V. JAKOB VEHICLE ROLLER IACK.

APPLICATION FILED SEPT. 5, 1919.

4 SHEETS-SHEET 3.

.3.1. MIZER AND V. JAKOB..

VEHICLE ROLLER JACK.

APPLICATION FILED SEPT. 5, 1919.

Patente@ Deo. 5g 1922,

4 SHEETS-SHEET 4.

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MILLE Patented 5, w22..

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A are "si go gil. llii l@ MANUFACTURXNG CMPANY, CUNSN.

Application led September 5, i919. Serial No. 321,372.

To all whom' 'it may concern.'

Be it known that we, ilosnrrr il'. Mizee, a citizen oit thellnitedStates, and Vieron danois, a citizen of Germany, residing" at liacine.in the county of Racine and State ot lllisconsin, have invented certainnew and useful llmprovements in Vehicle Roller Jacks, of which thefollowing' is a specification. i

Uur invention relates to a vehicle roller jack, and more particularly toa jack adapted to shiiit vehicles around in a garage having a relativelylong, horizontal trame, preferably comprising a forward base carrying alifting member and a rear base having suitable mechanism for operatingthe' vlifting member, the forward base beingthe one which is adapted tobe pushed under the load to be raised, for example, the axle of anautomobile, said bases preferably being mounted on rollers or castersand being spaced far enough apart and rigidly connected by suitable barsso that when the forward base is under the axle of an automobile and thesame is raised suiiiciently so that the wheels thereof will clear theconnecting bars the rear base may be swung around under one of thewheels out ot the way and repairs or replacements may be convenientlymade.

@ne ot the objects of our invention is to provide an improved jack ofthis type which may be conveniently operated from a distance clear ofthe load being lifted, the operatingconnections or' which may be readilyshifted out of the way when it is desired to worlr on the automobile orother load beingsupported by the jack.

A 'further object of our invention is to provide improved and novelmeans in a jack of this type whereby the jack will be capable of a widerrange of movement than has been possible Yto obtain in prior devices,

whereby a series of liftingf operations may be performed and the objectraisedto the desired height.

A further object of our invention is to provide in a jaclr of this typeimproved, quick acting,r means for taking upwhatever lost motion theremay be between the initial position of the lifting* member and the obmliect tobe raised and for releasing the litt-- ing member so that it maydescend to its the operation of a single control rod.

A turther object of our invention is to provide in a jack of this typeimproved .means for control-ling the mechanism which operates to raiseand lower the lifting member, the means preferably being operated by asingle control rod located, for example, on the operatinghandle andwhich may be set in one position to cause the lifting member to beraised, in another position 'to cause it to be lowered, and in a thirdposi tion to loclr it.

The invention consists oil the novel and improved constructions,arrangements and devices to be hereinafter described and claimed :torcarrying out the above stated objects and such other incidental objectsas will appear from the following description.

The invention is illustrated, in certain preferred embodiments, in the`accompanyine* drawings wierein* Fien l is a side elevational view of ajaclr embodyingr the principles of our invention,V

certain parts beingI shown in section, a portion of the connecting bars,connectingn rod and pedal control rod being' broken out and theoperatinghandle being locked in the lifting position and the upper endthereolE broken on?.

lling. 2 if* a side elevational view of the upper end ot the operatinglever, certain parts thereol being shown in section.

Fig. 3 is a iront view of that portion of the operating handle shown inllig. 2.

Fig. l is an enlarged on line '4e-4l et Fig. 2.

Fig. 5 is a detail view ot one side oit' the forward baseshowing` oneoi' the curved guidingl grooves for the rack guide.

Fig. is elevational view of the side opposite to that shown in l, thelifting member being in its llowermost position in the rack guide.

Fig. l is a side elevational view oit the forward base, certain parts'being in section and the liftinga member elevated in. the rack guide bymeans of the pedal control rod.

Fig. 8 is an elevational view similar to sectional view teiten n litiFig. l showing the parts in the position they assume after the operatinghandle has made its initial lifting movement.

Figs. 9, 10, ll and 12 are sectional views, respectively, taken on thelines 9-9, itl-16, ll-ll and 12-12 of Fig. l, and

Figs. l and le are sectional views, respectively, taken on the lines13-13 and ll-M of Fig. l2.

Like characters of reference designate like parts in the several figuresof the drawings.

The frame of the jack comprises a forward base member and a rearwardbase member 2l rigidly connected together' by means of the bars 22, thelength of the bars being such that when the forward base member is underthe axle of an automobile and the wheels thereof raised suiiiciently soas to clear the bars the rearward portion of the jack may be swungaround underneath one wheel out of the way so that 'repairs andreplacements may be conveniently made.

The forward base member has integrally formed therewith two parallelside members 23 between which the rack guide or carriage 24 and itsassociated operating mechanism are mounted. rl`he rack carriage ismounted between the horizontal arms 25 of a bell-crank lever 26 beingpivotally connected to the shaft 2T which entends through the arms 25.The bell-crank lever is pivotally mounted on the shaft 28 which extendsthrough the side members 23, the lower end of the vertical arm 29 ofsaid lever being pivotally connected t a clevis 3() which is secured tothe forward end of a connecting rod 3l, the purpose of which will behereinafter described. The side mem* bers 23 are formed with grooves orguideways 32, theSe guide-ways being formed on a radius equal to theradius of the horizontal arms 25 of the bell-crank lever. rl`he forwardside of the raclr carriage is provided with a transverse perfo 1ationfor the reception of a shaft 33 on each end of which a roller 34 ismounted. these rollers being adapted to run in the guide-ways lt willthus be seen that when the horizontal arms of the bell-crank lever areforced upwardly the rack carriage will rock on the shaft 27 and be heldin a perpendicular position by the rollers 3a operating in the guideways32.

'fllhe rack carriage is in the form of a housing` with a rectangular,vertical pasW sageway 35 for the reception of the rack bar 86. @n therear side of the rack carriage two vertical flanges 37 are formedbetween which a pawl 38 is pivotally inounted, the upper end of the pawlextending through the perforation 89 formed in the rear side of the rackcarriage and engaging the teeth 40 formed on the raclr` bar 36, the pawlnormally being held in engagement with said teeth by means of a springel. rthe upper end of the rack bar is provided with a swivel cap 42which may bel of any common construction. One side of the rack carriageis formed with an internal vertical channel i3 in'which the pin Lleisecured to the raclr bar may travel, the channel i3 terminating short ofthe top of the raclr carriage so as to form the stop l5 for the pin #lethereby limiting the upward movement of the rack bar. @ne side of therack carriage is preferably formed with a vertical dove-tailed guide-way46 for the reception of a rack lifting member 47, the top of which isadapted to bear against the underside of the cap 42, rllhe member e? isformed with an outwardly projecting lug #i8 which is adapted to beengaged by a lifting lever 119, the operation of which will be morefully described hereinafter. A web 50 is preferably formed across theguide-way 46 to form a stop which engages the lug 48 thereby limitingthe upward movement of the member 47.

The forward base preferably is mounted on a pair of wheels 51 which aremounted on the ends of the transverse axle 52 supported in the bearing53 which preferably is cast integrally on the front side of the basemember adjacent its lower end.

The rear base member preferably comprises a horizontal "yf-shaped webportion 5l, which may be braced underneath by suitable longitudinal andtransverse ribs 55, and a longitudinal upright web portion 56. The basepreferably is mounted on casters 57 the housings of which are secured tothe web portion 5l by the rivets or bolts 56. @n the upper Side of theweb porn tion 54 is formed the longitiuilinal guideway 55) in which therack bar 60 is adapt-cd to reciprocate, the rack bar being pivotallyconnected to the rear end of the connecting rod 3l and formed on itsupper side with the teeth 6l. is shown in the drawings, the web member56 is formed with an opening 62 to provide room for 'the various pawlsfor operating the jack. rllhe lifting member of the jack is operated bya bell-crank lever 63, the lower portion of which is preferablybifurcated, the arms 64 thereof being adapted to straddle the webportion on which the lever is pivoted 65. rlifting pawl 66 adapted toenthe teeth on the rack bar is mounted between the power arms 6T of thebellcrank on a pivot 68. A. holding pawl 69 also adapted to engage theteeth on the rack bar 60 is mounted on a pivot pin 70 which eX- tendsthrough a depending lu(Y 7l of the web portion 56. A lifting lever (2.the arms '(3 of which embrace the arms 6T of the bell-crank lever andare pivotally mounted on the pivot 68, is provided for lifting theholding pawl 69 out of engagement with titl the teeth 61 of the rack bar60 when the hell-crank operating lever 63 is operated to lower the loadof the jack, one of the arms 73 of the lever 72 being formed with annpstanding perforated lug'7l1 to which one end of a coil spring 7 5 isattached, the purpose of this spring being hereinafter eX- plained. 'lhemovement of the lever 72 is limited with respect to the lifting pa'wl 66this pawl having a small pin or lug 7 6 projecting laterally from oneside through the relatively large perforation 77 formed in the adjacentarm 73 of the lever 72. rlhe upper edge of the rear part of the webmemher 56 is in the form of a segment formed with ay plurality ofnotches 78 which are adapted to receive the cross-bar of a llshapedlatching member 79 the side arms 80 of which embrace the operating arms81 of the bell-crank operating lever the arms 80 being pivotally mountedon a pin 82 which extends through the arms 81 of the operating lever.rllfhe upper end of the spring 75 is formed so as to provide a slot 83.The latching member 7 9 is formed with a lug 84e which 'projects throughthe slot 83. When the operating lever 63 is in the position shown in Fig. 1 and the latching member 79 is lowered into engagement with one ofthe notches 78, the lug 8e of the latching member rests in the bottom ofthe slot 83 the spring 75 not being under tension. However when theoperating lever 63 is in the position shown in Fig. 8 and the latchingmember 79 is raised to its uppermost position, by means to behereinafter described, the lug 84 will engage the top of the slot 83thereby placing the spring 75 under tension andraising the lifting lever72 and the holding pawl 69 to the positions shown in dotted lines whenthe load is sustained by the pawl 66 which is the case at certainperiods of the lowering operation.

'lhe operating handle preferably cornprisestwo bars 85 which arev boltedat their lower ends to the operating arm of the bellcrank 63 and attheir upper ends to a easting 86 in which a transverse metal handle har87 is mounted. 'llhe casting 86 entends downwardly hetween the bars 85and is formed on the rearward side with three notches 88, 89 and 90,(Fig. 2) which have heen legended respectively Lower Lift and Lock Asshown in Figs. 3 and l the casting 86 is formed with a vertical slot 91which is adapted to receive the horieontal arm 92 of the controllingmember 93. The controlling memher 93 is formed with the lugs 9e whichare adapted to enter the notches formed in the side of the casttlli ing86. 'llhe controlling member normally being held in these notches bymeans of a spring 95 mounted on the end of the arm 82 between. thewashers 196 and 197 which bear respectively against the end of the armand the casting 86. rl`he controlling member 93 has threaded engagementwith the upper 'end of the rod 98, the lower end of this rod beingpivotally mounted on the lug 811 of the latching member 79. A handle 99is formed on the controlling member 93 to facilitate moving it from oneposition to another.

ln order to enable the operator to take up quickly whatever lost motionthere may be between the cap ft2 of theY lifting member and the load tobe lifted preparatory to lifting the same with the hand operated lever63, the `jack is provided with a double acting foot lever 100 fulcrnmedon the pin 65 and is provided with depending arm 101 pivotally connectedto the pedal control rod 102. yllhe forward end of the pedal rod ispivotally connected to the arm 103 of the crank shaft 104: which ismounted hetween the side members 23 of the forward base. 'lhe crankshaft 104iis formed with an upstanding arm 105 which is provided with alaterally extending lug 106which is adapted to engage the upstanding lug107 of the rack-bar lifting lever t9 when the arm 108 of the foot pedal100 is depremed for thrusting the pedal rod 102 forwardly,

thereby causing the crank shaft 1011- to rotate in a clockwise directionas seen in Figs. 1 and 8. This movement of the crank shaft causes thelifting lever t9 to be rotated on the crank shaft 101i thereby raisingthe lifting member e7, the cap t2 and the rack bar 36. The crank shaft10ft is provided also with another upstanding arm 109 to which the lever110 is pivo'tally connected, this lever operating hetween two lugs 111formed on the inner side of one of the side members 23 of the forwardhase, a keeper 112 heing attached vto the lugs 111 thereby forming aguide for the lever 1101.. When the pedal 113 of the foot lever 160 isdepressed with the carriage 2t in its lowered position as shown in Figs.1 and 7 the pedal rod 102 is moved hackwardly the-relay causing thecrank shaft 104C 'to be rotated in a counter-clockwise direction in saidFigs. 1 and 8 whereby the lever 110 is thrust forwardly into engagementwith the lower end of the pawl 38 causing the pawl to he thrown out ofengagement with the teeth on the rack-bar 36, thereby permitting therack bar to drop.

peration; When lifting a vehicle, for eX- ample, the jack is broughtinto position so that the cap d2 on the lifting har 36 will beunderneath the part of the vehicle to he engaged. The pedal 108 is thendepressed which, as hereinhefore described, causes the rack har 36 to heraised up to the axle or that part to be engaged (Fig. 7) the rack barbeing retained in that position relative to the rack carriage by meansof. the

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pawl 38. rlhe controlling member 93 is then adjusted so as to be inengagement in the notch 89 which raises the latching member 79suliciently to' clear the notches 78 of the segment on the web member 56in which position, however, the spring 75 attached to the lifting memberv72 will not be under tension. The operating handle is then brought intothe position shown in Fig. 8 which causes the lifting pawl 66 to pushthe rack bar GO forwardly sufficiently to permit the holding pawl 69 todrop into engagement with theftooth just ahead of the one previouslyengaged by the lifting pawl. Forward movement of the rack bar GO causesthe connecting rod 3l to be moved forwardly thereby rotating the bellcrank 29 in a clockwise direction in said Fig. 8 and raising the rackcarriage 24 to the position shown in said figure, the rollers 3aoperating in the guide ways 32 being effective to retain the rackcarriage in a perpendicular position. Since the holding pawl is now inengagement with one of the teeth of the rack bar 6() the operatinghandle may be raised again to the position shown in Flo'. l whichpermits the lifting pawl 66 to drop into engagement with the next toothin the rear and the rack bar 60 may then be again pushed forwardly asjust described, the holding pawl 69 'again riding up over and droppinginto engagement with the next tooth in the rear. The carriage 52st isthus moved upwardly step by step. rlhe jack shown in the drawings isdesigned to permit three lifting operations by the operating handle. Itwill be obvious, however, that the mechanism mounted on the forward basemay be designed and proportioned and a larger number of teeth formed onthe rack bar o() so that a considerably greater range of movement of therack bar 36 and rack carriage 24C may be obtained, this being merely amatter of design and not departing from the principles of our invention.

lWhen it is desired to lower the load. the controlling lmember 93 islifted into engagement with the notch 88 which raises the latchingmember 79 so that the spring 75 is placed under tension resulting in thelifting member 72 being raised, which alternately raises pawls 69 and66, the pawl 6G because of the engagement of its pin 7G with member '72.llllhen the spring 75 is under tension and operating lever 63 is in theposition shown in Fig. l the pawl 66 is lifted out of engagement withthe teeth on the rack bar. the load being sustained by the holding paf`Yl 69. The lever 68 is then lowered into the position shown in F ig. 8,the member 72 being then in engagement with the under surface of pawl 69due to the action of spring 75, the pawl 66 is crowded downward againstthe tension of spring 75 and into engage ment with the tooth ust behindthe one engaged by pawl 69. A slight further downward movement of lever63 results in the load being transferred from pawl 69 to pawl 6G.Because of the loose engagement of pin 7G in perforation 77 of member72, the meinber 72 is pulled upwardly by spring 7 5 sulliciently to liftpawl 69 into the dotted line position so that it will pass over thetooth just ahead of it and as the lever 63 is raised member 72 iswithdrawn from under pawl 69 and as the rack bar moves backwardly, pawl69 drops down into engagement with the next tooth ahead. When theoperating handle is then raised sufficiently, the loa-d is transferredfrom pawl 66 to pawl 69, and the lowering operation just described maythen be repeated, the rack carriage being permitted to descend step bystep until the jack is freed of its load. rlhe foot pedal may then bedepressed which as hereinbefore described, trips the pawl 38 therebypermitting` the rack bar 3G to descend to its `initial position.

The jack is strong and since it is supported on rollers or casters itmay be used for shifting disabled vehicles around in a garage, forexample. The device provides a powerful leverage and enables theoperator to handle a heavy load very easily and quickly. if desired, thehandle of the jack may be raised and locked in upright position when thejack is supporting a loa-'d by adjusting the controlling member 93 so asto engage the notch 90.

lt will be obvious that` various modifications might made in the j aclrw'thout departingv from the principles of our invention. llre do notintend therefore to limit our invention to the constructions,arrangements and devices shown and described except only in so far ascertain of the appended claims are specifically so limited.

ille claim:

l. A. lifting jack comprising in combination a frame, a horizontallyextending arm pivotally mounted on a horizontal axis on said frame, alifting member pivotally connected with said horizontal arm and adaptedto swing up and down with the arm about the said axis, power meansadapted by a plurality of operations to give said arm a step-by-stepmovement for carrying the lifting member upwardly, and meansizo-operating with said arm for holding the lifting 1 member fromswinging out of vertical position as it moves upwardly.

l lifting jack comprising in combination a frame, a. horizontallyextending arm pivotally mounted on a horizontal anis on said frame, alifting member pivotally connected with said horizontal arm and adaptedto swing up and down with the arm about the said axis, a rod slidablymounted on said frame. connections between said rod and said Sii lll@

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arm adapted upon a longitudinal movement of the rod to move said arm andsaid lifting member vertically, power means for moving said rodlongitudinally, and means Jfor maintaining said lifting member inelevated position for supporting a load.

3. A lifting jack comprising in combination a trame, a bell crank leverpivoted on said trame and having Ahorizontally and downwardly extendingarms, a lifting mein ber pivotally connected near its upper end withsaid horizontal extending arm, a rod pivotally connected with saiddownwardly extending arm, power means mounted on said trame ata'distance from the bell crank lever adapted through the medium of saidrod to swing said bell-crank lever on its pivot for raising said liftingmember, and rneans engaging the lower end portion of said lifting memberbelow said horizontally extending arm for holding said lifting memberfrom swinging out of vertical position on said frame.

d. A lifting jack comprising in combination, a frame, a bell crankpivoted in said trame, a load engaging member pivoted to one arm of saidbell crank,l power means associatedwith the other arm of said bellcrank, whereby said bell crank may be oscillated and said member raisedor lowered, said iramehaving a guideway, and a. roller mounted on saidmember and adapted to engage said guideway, said guideway being curvedand adapted to maintain said mem.- ber perpendicularly during theraising and lowering thereof.

A liftingjack comprising in combination, a frame having two spaced sidemembers, a bell crank pivoted between said members, a load engagingmember pivoted to one arm of said bell crank, power means associatedwith the other arm of said bell crank whereby said bell crank may beoscillated and said load .engaging member raised or lowered, said sidemembers having guideways, and rollers on said load engaging memberadapted to engage'the respective guideways, said guideways being formedon a radius struck from a perpendicular line running through the aXis ofsaid bell crank and substantially equal to the radius of the arm of thebell crank to which said load engaging member is pivoted.

6. A vehicle jack comprising in combination, a horizontal frame, rollersadapted to support said frame, ya bell crankhaving substantiallyhorizontal and vertical arms pivotally mounted in one end or said frame,load engaging means mounted on the horizontal arm of said bell crank,and operating means connected to the lower end or' the vertical arm ofsaid bell crank and operable from the other end of said frame wherebysaid bell crank may be oscillated and said load engaging means raisedand lowered, the

middle portion or said frame and said operatin means being arrangedrelatively close to tie ground whereby said frame may be swung aroundunder the wheels of the vehicle when the saine is raised.

7. A lifting jack comprising incombination, a horizontal iframe, a bellcrank pivoted in one end or' said frame, a carriage pivoted to one armor' said bell crank, a rack bar adjustably associated with saidcarriage, power means mounted in the other end of said trame andassociated with the other arm o said bell crank whereby said bell crankmay be oscillated and said carriage and rack bar raised or lowered, andmeans adapted to maintain said carriage perpendicular during the raisingand lowering thereof.

8. A lifting jack comprising in combination, a horizontal trame, a bellcrank pivoted in one end of said trarne, a carriage associated with onearm of said bell crank, a rack bar adjustably associated with saidcarriage, power means mounted in the other end of said frame andassociated with the other arm of saidbell crank whereby said bell crankmay be oscillated and said can riage and rack bar raised or lowered, andmeans for raising said rack bar relative to said carriage.

9. A lifting jack comprising in combination, a horizontal frame, a bellcrank piv* oted in one end of said frame, a carria e associated with onearm of said bell cran r, a rack bar adjustably associated with saidcarriage, power means mounted in the other end of said frame andassociated with the other arm of said bellv crank whereby saidA bellcrank may b-e oscillated and said carriage and rack bar raised orlowered, and means .for raising or lowering said rack bar relative tosaid carriage.

l0. A lifting jack comprisin in combination, a horizontal frame, a belcrank pivoted in one end of said frame, a carriage associated with onearm or'` said bell crank, a rack bar slidably associated with Saidcarriage, a pawl pivoted on said carriage and adapted to engage theteeth on said rack bar, power means mounted in the other end l of saidtrame and associated with the other arm or said bell crank whereby saidbell crank may be oscillated and said carriage andrack bar raised orlowered, means for raising said rack bar relative to said carriage, andmeans for tripping said pawl thereby permitting it to drop relative tosaid carriage.

ll. A lifting jack comprising in combination, frame., a bell crankpivoted in said frame, a carriage associated with one 'arm of said bellcrank, a rack bar slidably associated with said carriage, a pawl pivotedon said carriage and adapted to engage the teeth on said rack bar, powermeans associated with the other arm of said bell crank whereby Cit saidbell crank may be oscillated and said carriage and rack bar raised orlowered, and unitary means which when moved into one position causessaid rack bar to be raised relative to said carriage and when moved intoanother position causes said pawl to be tripped thereby permitting saidrack bar to drop relative to said carriage.

12. i lifting jack comprising in combina tion, a frame, a bell crankpivoted in said frame, a carriage associated with one arm of said bellcrank, a rack bar slidably associated with said carriage, a pawl pivotedon said carriage and adapted to engage the teeth on said rack bar, powermeans associated with the other arm of said bell crank whereby said bellcrank may be oscillated and said carriage and rack bar raised orlowered, a crank shaft jonrnaled in said frame, means to oscillate saidshaft, means associated with said shaft and adapted upon oscillationthereof in one direction to raise said rack bar relative to saidcarriage, and means associated with said shaft and adapted uponoscillation thereof in the other direction to trip said pawl therebyTpermitting said rack bar to drop relative to said carriage.

13. A lifting jack comprising in combination, rame, a bell crank pivotedin said frame, a cordage associated with one arm of said bell crank,rack bar slidably associated with said carriage, a pawl pivoted on saidcar ia-ge and adapted to engage the teeth on said rack bar, power meansassociated with the other arm of said bell crank whereby said bell crankmay be oscillated and said carriage and rack bar raised or lowered, acrank shaft journaled in said4 frame, double acting means adapted tooscillate said shaft, a lifting member associated with said shaft andadapted upon oscillation thereof in one direction to raise said rack barrelative to said carriage, and a lever associated with said shaft andadapted upon oscillation thereof in the other direction to trip saidpawl thereby permitting said rack bar to drop relative to said carriage.

le. ln a jack having a horizontal frame, the combination of a liftingmember mounted in the forward end of said frame, a rack bar slidablyassociated with said member, and means, operable by a single controlmember mounted in the rearward end of said frame, adapted to raise orlowersaid rack bar relative to said lifting member.

15. In a jack having a horizontal frame, the combination of a liftingmember mounted in the forward end of said frame, a rack bar slidablyassociated with said member, a crank sha-ft journaled in said frame,means mounted in the rearward end of said frame and adapted to oscillatesaid shaft, means associated with said sha-ft and adapted uponoscillation thereof in one direction to raise said rack bar relative tosaid member, and means associated with said shaft and adapt ed uponoscillation thereof in the other direction to permit said rack bar todrop relative 'to said member.

16. .in a jack having a lifting member mounted in the frame thereof, thecombina* tion of rack bar slidably associated with said member, a pawlpivoted to said member and adapted to engage said rack bar, a crankshaft mounted in said frame, a double acting foot pedal mounted on saidframe and operatively connected to said shaft, means associated withsaid shaft and adapted to raise said rack bar relative to said memberwhen the foot pedal is ac tuated in one direction, vand means associatedwith said shaft and adapte(L to trip said pawl when the foot pedal isactuated in the opposite direction whereby said rack bar is loweredrelative to said member.

17. ln a jack having a. lifting carriage mounted in the frame thereof,the combina tion of a rack bar slidably associated with said carriage, apawl pivoted to the car riage and adapted to engage said rack bar, acrank shaft mounted in said frame and operated by a control lever, alever associated with said shaft and adapted to engage the rack bar whensaid control lever is moved in one direction whereby said. rack bar israised relative to said carriage, and a member associated with saidshaft and adapted to trip said pawl wnen the control lever is moved inthe opposite direction whereby said rack bar is lowered relative tosaid'carriage.

18. A lifting jack comprising in combination, a horizontal frame, alifting member mounted in one end of said frame, a rack bar slidablyassociated with said member, means operable by a single control rodadapted to raise or lower the rack bar relative to said member, andmeans adapted to raise or lower said member relative to said frame, bothsaid means being operable from the other end of said frame.

19. A lifting ack comprising in combination, a horizontal frame, a bellcrank pi'voted in one end of said frame, a lifting member associatedwith one arm of said bell crank, a rack bar slidably associated withsaid member, power means associated with the other arm of said bellcrank and adapted to oscillate said bell crank, thereby raising orlowering said member relative to said frame, and means adapted to raiseor lower said rack bar relative to said member, both said vmeans beingoperable from the other end of said frame.

Q0. A lifting jack comprising in combination, a horizontal frame, a bellcrank pivoted in one end of said frame, a lifting member associated withone arm of said bell crank,

merece rack bar slidably associated with said member, a lever fulcrumedon the other end of said frame and roperatively connected to the otherarm of said bell crank, whereby said bell crank may be oscillated andsaid member raised or lowered relative to said frame, and double actingmeans mounted in the last mentioned end of said frame, associated withsaid rack bar and adapted to raise or lower the same relative to saidmember.

2l. A lifting jack comprising a horizontal frame, a load engaging membermounted in one end of said frame, a rack bar mounted in the other end ofsaid frame, vmeans connecting said rack bar with said member, and meansadapted to move said rack bar step bystep whereby said member may beraised or loweredo 22. A lifting jack comprising in combination, ahorizontal frame, a bell crank pivoted in the forward end of said frame,a lload engaging member associated with one arm' of said bell' crank, arack bar associated with the other arm of said bell crank, and powermeans operated from the rearward end of said frame and associated withsaid rack bar, whereby said bell crank may be oscillated and said memberraised or lowered step by ste gli. ln al lifting jack having ahorizontal frame, the combination of a bell crank pivotally mounted inthe forward end of said frame, a lifting member pivoted to one arm ofsaid bell crank and guided in said frame, a rack bar slidably mounted inthe rearward end of said frame vand connected to the other arm of saidbell crank, and a lever fulcrumed in the rearward end of the frame andadapted to engage said rack bar to move it forwardly thereby raisingsaid lifting member.

2d. lin a lifting jack having a horizontal frame, the combination of abell crank pivotally mounted in the forward end of said frame, a liftingmember pivoted to one arm of said bell crank and guided in said frame, arack bar slidably mounted in the rearward end of said frame andconnected to the other arm of said bell crank, a lever fulcrumed in therearward end of the frame and adapted to engage said rack bar to movefill ti li it forwardly thereby raising 'said lifting member, and meansto prevent said rack bar from slipping backwardly while said lever isbeingl positioned for a further movement of said rack bar.

25. ln a lifting jack having a horizontal frame, the combination of abell crank pivotally mounted in the forward end of said frame, a liftingmember pivoted to one arm of said bell crank and guided in said frame, arack bar slidablymounted in the rearward end of said frame and connectedto the other arm of said bell crank, a lever fulcrumed in the rearwardend of the frame and having a pawl adapted to engage the teeth on saidrack bar whereby said rack bar may be moved forwardly and saidliftingmember raised, and a pawl pivoted to said frame and adapted toengage the teeth on said rack bar to prevent backward movement of saidrack bar while said lever is being positioned or further forwardmovement of said rack 26. ln a lifting jack having a horizontal frame,the combination of a bell crank pivotally mounted in the forward end ofsaid frame,.a lifting member pivoted to one arm of said bell crank andguided in said frame, a rack bar slidably mounted in the rear end ofsaid frame and connected to the other arm of said bell crank, a bellcrank operating lever fulcrumed in the rearward end of the frame havinga pawl pivoted to the power arm thereof and adapted to engage the teethon said rack bar whereby said rack bar may be moved forwardly and saidlifting member raised, and a pawl pivoted to sa1d frame and adapted toengage the teeth on said rack bar to prevent backward Vmovement thereofwhile said operating lever is being positioned for further forwardmovements of said vrack bar.

27. ln a lifting jack having a horizontal frame, the combinationof abell crank pivotally mounted in the forward end of said frame, a liftingmember pivoted to one arm of said bell crank and guided in said frame, arack bar slidably mounted in the rearward end of said frame andconnected to the other arm of said bell crank, a bell crank operatinglever fulcrumed in the rearward end of said frame and having a pawlpivoted thereto adapted to engage the teeth on said rack bar wherebysaid rack bar may be moved forwardly and said lifting member raised,holding means to prevent backward movement of said rack bar while saidlever is being positioned for further lifting movements, and automaticmea-ns adapted to alternately release said holding means and lift saidpawl when said lever 1s operated, thereby lower ing said lifting member.

28. ln a lifting jack having a horizontal frame, the combination of abell crank pivn otally mounted in the forward end of said frame, alifting member pivoted to one arm of said bell crank and guided in saidframe, a rack bar slidably mounted in the rearward end of said frame andconnected tothe other arm of said bell crank, a bell crank operatinglever fulcrumed in the rearward end of said frame and having liftingpawl piveted on the-power arm thereof and adapted to engage the teeth onsaid rack bar wherebtY in rack bar may be moved forwardly ani liftingmember raised, a holdin?, par-vi oted to said frame and vadapte l toore` backward movement of said rack bar lill@ lllti CII said lever isbeing positioned for further lifting movements, and automatic meansadapted to alternately lift said pawls when said lever is operated,thereby lowering said lifting member.

29. ln a lifting jack having a horizontal frame, the combination of abell crank pivotally mounted in the forward end of said frame, a.lifting member pivoted to one ariii of said bell crank and guided insaid frame, a rack bar slidably mounted in the rearward end of saidframe and connected to the other` arm of said bell crank, a bell crankoperating lever fulorumed in the rearward end of `said frame and having`a lifting pawl pivoted on the power aim thereof and adapted to engagethe teeth on said rack bar whereby said rack bar may be moved forwardlyand said lifting member raised, a holding pawl pivoted to saidframe-work and adapted to prevent backward movement of said rack barwhile said lever is being positioned for further lifting movements, andmeans pivoted to said lever which, when said lever is operated tosustain the load` lifts said holding pawl over the tooth previouslyengaged and as 'the operating lever is re versed and the rack bar movedbaclnvardly permits it to engage theV next forward tooth.

30. lin a lifting jack having a horizontal frame, the combination of abell crank pivotally mounted in the forward end of said frame, a liftingmember pivoted to one arm titi of said bell crank and guided in saidframe. a rack bar slidably mounted in the rearward end of said frame andconnected to the other arm of said bell ora-nk, an operating leverfiilerumed in the rearward end of said frame and having a pawl pivotedthereto adapted to engage theA teeth on said rack bar whereby said raeirbar may be moved forwardlyv and said lifting member raised, a holdingpawl pivoted to said frame and adapted to prevent backward movement ofsaid rack bar while said lever is being positioned for further liftingmovements, a` pivoted lever, and means whereby said pivoted lever islifted to raise said holding pawl when said operating lever ispositioned to sustain the load whereby said holding pawl is positionedto engage the next forward tooth of the rack bar when the operatinglever is reversed to lower the load.

31. ln a lifting `mok having a horizontal frame, the combination of abell crank pivotally mounted in the forward end of said frame, a liftingmember pivoted to one arm of said bell crank and guided in said frame` arack bar slidably mounted in the rearward end of said frame andconnected to the other arm of said bell crank, a bell crank operatinglever fulcrumed in the rearward end of said frame and havingr a lifting'pawl pivoted on the power arm thereof and adapted to engere the teeth onsaid rack bar whereby said rack bar may be moved forwardly and liftingmember raised, a holding pawl pivoted to said frame and adapted ventbackward movement of said rack bar while said lever is being positionedfor further lifting movements, a lever adapted to engage said holdingpawl and pivoted to the power arm, a controlling member mounted on theoperating arm of said bell Crank opermting1 lever, and a springconnection between said pivoted lever and said controlling memberwhereby said holding pawl is positioned to engage the next forward toothon the rack bar when the operating lever is reversed to lower the load.

32. ln a liftingjr jack having a horizontal frame, the combination of abell Crank pivotally mounted in the forward end of said frame, a liftingmember pivoted to one arm of saidbell crank and guided in said frame. arack bar slidably mounted in the rearward end of said frame andconnected to the other arm of said bell crank, a bell crank operatA ingnlever fulerumed in the rearward end of said frame and having a liftingpawl pivoted on the power arm thereof and adapted to engage the teeth onsaid rack bai' whereby said rack bai' may be moved forwardly and saidlifting member raised, a holding pawl piv oted to said frame and adaptedto prevent f backward movement of said rack bar while said lever isbeingpositioned for further lifting` movements, a pivoted lever adaptedto alternately lift said pawls, and a controlling'inember mounted on theoperating arm of said bell crank lever and connected to said pivotedlever which controlling member in one position causes said operating lever to raise and in another position to lower the load.

33. ln a lifting jack having, a horizontal frame, the combination of'abell crank pivotally mounted .in the forward end of said frame` alifting member pivoted to one arm of said bell crank and guided in saidframe, a rack bar slidably mounted in the rearward end of said frame andconnected to the other arm of said bell crank, an operating leverfulcrumed in the rearward end of said frame and having a paw] pivotedthereto, a liold inf; pawl pivoted on said frame, each pawl beingadapted to engage the teeth on said rack bar. and controlling* andactuating means which when set in one position causes the rack bar tomove forwardly step by step and when set in another position causes itto move backwardly step by step when the operating lever is manipulated.

34. A lifting jack comprising in combination a horizontal frame, a bellcrank pivoted in one end of said frame, a load engaging member mountedon one arm of said bell crank. a rack bar mounted in said frame andoperatively connected to the other arm of said bell crank, power meansassocia-ted with said rack bar whereby said member may be moved step bystep, and means which is adapted when set in one position to cause saidpower means when operated to raise said member, and when set in anotherposition, to cause said power means when operated to lower said member.

35. A lifting jack comprising in combination a horizontal frame, a loadengagino,` member mounted in one end of said traine, a rack bar mountedin said frame, lifting means connecting said rack bar with said member,power means associated with and adapted to move said rack bar relativeto said frame, and means which is adapted when set in one position tocause said power' means when operated to move said rack bar in onedirection thereby raising said member, and when set in another positionto cause said power means when opera-ted to move said rack bar in theopposite direction thereby lowering said member.

36. A lifting jack comprising in combination a horizontal `frame, a bellcranh pivoted in said trame, a load engaging member mounted on one armof said bell cranlr, a rack bar mounted in said trame and operativelconnected to the other arm of said bell cran powermeans associated withsaid rack bar whereby said member may be moved step by step, andcontrolling means which when inoperative permit saidl power means whenoperated to raise said member,- and when op.- erative causes said powermeans when operated to lower said member.

37. A lifting jack comprising in combination a horizontal fra-me, a loadengaging member mounted in one end of said'gtrame, a rack bar mounted inlsaid frame, iiting means connecting said rack bar with said member,power means associated with and adapted to move said raclr bar relativeto said frame, an'd controlling. means which when inoperative causessaid power means when operated to move said rack bar in one directionthereby raising said member,

and when operative causes said power means when operated to move saidrack b ar Iin the opposite direction thereby 'lowering said,

.-member.

38. A lifting jack comprising in combination a horizontal frame, a bell;crank pivotedy in said trame,- a load en aging member mounted on Aonearm oi3 sai bell crank, a rack barmounted in said iframe and operativelyconnected to the other arm oit said bell crank, power means, mechanismasso-- oiated with said. power'means and said rack' bar whereby saidmember islifted when said power means is operated, and reversing meansassociated with said mechanism and adapted to cause said mechanism tolower said member when said power means is operated. 39. A lifting jackcomprising in combination a horizontal frame, a load engaging membermounted in one end of said frame, a rack bar slidably mounted in saidframe,

lifting means connecting said rack bar with `member mounted in one endof said frame, a

rack bar mounted in the other end of said trame, lifting meansassociated with said member and said rack bar, a holding pawl engagingsaid iaclr bar, power means, a pawl pivoted to said power means andengaging said rack bar whereby said member may be lifted when said powermeans is operated, and' means ior alternately lifting said pawls wherebysaid member may be lowered when said power means is operated.

el. A lifting jack comprising in vcombination a frame, a load engagingmember mounted in said frame, a. rack bar mounted in the other end ofsaid iframe, lifting mechanism associated with said member and said rackbar, a holding pawl engaging said rack bar, power means, a lifting pawlpivoted to said power means and engaging said rack bar whereby saidmember may be lifted when said power means is operated, and springactuated mechanism for alternatelv lifting said pawls when said powermeans is operated whereby said members may be lowered.

4Q. A lifting jacht comprising in combination ay frame, a load engagingmember mounted in said frame, a. rack bar mounted in said iframe,lifting mechanism associated with said member .said rackbar, a holdingpawi engaging said rack bar, power means, a lifting pawl pivoted to saidpower means and engaging said rack bar whereby said member may be liftedwhen said power means is operated, a lifting member associated with saidpawls, a spring .normally inoperative and associated with said liftingmember, and means to make said springv efective, whereby said pawls areaiternately lifted when said power means is operated, thereby loweringthe load engaging member.

a3. A iitting jack comprising in combimounted in said frame, a rack barmounted in said trame, lifting mechanism associated with said member andsaid rack bar, a holding pawl engaging said rack bar, an operating leverpivoted on said trame, a lifting pawl 'pi-voted to said lever, andengaging vnation a frame, a load engaging member said rack bar wherebysaid member ma be i lifted when .said lever is operated, a li tingmember associated with said pawl, a spring normally inoperative andassociated with said lifting member, and means to make said springeffective whereby said operating lever maybe positioned so that thelifting pawlV will sustain the load, whereupon said sprin causes saidlifting member to lift said hol ing pawl over one tooth of said rack barand permits it to come into engagement with the tooth nextl ahead as theoperating lever 1s operated to lower the load engaging member 44. Alifting jack comprising in combination -a frame, a load engaging membermounted in said frame, a rack bar'mounted in said frame, liftingmechanism associated 4 with said member and said rack bar, a holdingpawl engaging said rack bar, an operating lever pivoted on said frame, alifting pawl engaging said .rack bar, a lifting member connected to saidlifting pawl, said lifting pawl and liftingmember being pivoted on saidoperating lever, a spring associated with said lifting member andnormally inoperative, and means to make said spring operative, saidlifting memberbeing adapted to --ing pawl engaging said rack bar, anoperating lever pivoted on said frame, a lifting pawl engaging said rackbar,a U-shaped liftin member connected to said lifting pawl, saidlifting pawl and said lifting member bei pivoted on said lever, saidlifting meiher having limited movement relative to said lifting pawl, aspring normally inoperative and associated with 'said lifting member,and means to make said spring operative, said lifting member beingadapted to lift said holding pawl when said lifting 'pawl engages vthetooth on said rack v bar next -behind the one engaged by the holdingpawl whereby when said operating lever is manipulated, said loadengaging member is raised when said spring is inoperative, and loweredwhen it is operative.

46. A lifting jack comprising in combination a frame, a load engagingmember mounted in one end of said frame, a rack bar mounted in the otherend of said frame,

lifting mechanism associated with said member and said rack bar, aholding pawl engag-l ing said rack bar,-an operating lever pivoted onsaid frame, a lifting pawl pivoted member, and when said control deviceis set y in the other position, said pawls move to l lower the loadengaging member.

47. A lifting jack comprising in combination a frame, a load engagingmember mounted in said frame, a rack bar mounted in said frame, liftingmechanism associated with said member and said rack bar, a holding pawlengaging said rack bar, an operating lever pivoted on said frame, alifting pawl pivoted on said lever .and engaging said rack bar, allifting member associated with said pawls, a springassociated with saidlifting member, and a two-position control device associated with saidspring, whereby when said operating lever is manipulated and saidcontrol device is set in one position, said pawls move to raise the loadengaging member and when said control device'is set in the otherposition, said pawlsl move to lower the load engaging member.

48, A lifting jack comprising in 'combi-V nation a frame, a loadengaging-member.

mounted in saidl frame, arack bar mounted in said'frame, liftingmechanism'associated with said member and said rack bar, a hold- .ingpawl engaging said rack bar, an operating lever pivoted on said frame, alifting pawl pivoted on said leverand engaging said rack bar, a liftingmember associated with said pawls, vsaid frame having a segment engagingsaid operating lever, a locking member on said operating leven andadapted to engage said segment, a spring connecting said lifting memberand said locking member, and a three-position control device associatedwith said locking member, whereby when said operating lever ismanipulated andsaid control device is set in one position said pawlsmove to raise the load engaging member, when said control device is setin another position'said pawls rmove to lower the load engaging member,and when said control device is set in its third position said operatinglever is locked to said'frame.

49. fn a lifting jack of the class described,

the combination of a rack bar slidably mounted in the frame thereof, anoperating lever fulcrumed on said frame and having a pawl pivot/ed'thereto, a holding pawl pivpted to said frame, each pawl being adaptedto engage theteeth on said rack bar,

said'. frame having a notched segment acl-- jacentsaid'operating lever,a locking meinber pivoted to said operating lever and adapted to engagesaid segment, and a three vso mareos Stil position controlling device onsaid operating handle which, when set in one position causes said rackbar to move in one directionstep by step, when in another positioncauses it to move in the opposite direction step by step and when in thethird position lockssaid .lever to said frame.

50. A vehicle jack comprising in combin nation a horizontal frame,rollers adapted to support said frame, a bell cranlr havingsubstantially horizontal and vertical arms mounted in the forward end ofsaid trame, a load engaging member mounted on the horizontal arm of saidbell cranlrs -a rack bar mounted in the rearward end ot' said frame,means operatively connecting said rack bar to the vertical arm ot saidbell crank, and operating mechanism mounted on the rearward end of saidframe and adapted to move said rack bar in either direction, wherebysaid load engaging member may be raised or lowered step by step, themiddle portion of said frame and the means connecting the rack bar tothe vertical arm of the bell crank being arranged relatively close tothe ground whereby said trame may be swung around under the wheels ofthe vehicle when the same is raised.

5l. ln a lifting jack having a horizontal frame comprising forward andrearward bases spaced apart and secured together by connecting bars, thecombination of a bell crank pivotally mounted in' the forward' base, acarriage pivoted to one arm of said bell crank, a rack bar slidablymounted in said carriage, a pawl pivoted 'to said carriage and adaptedto engage said rack bar, means mounted on said forward base connected toa doubleacting control pedal pivoted on the rear base whereby said rackbar may be raised by actuating said pedal in one direction and loweredby actuating the pedal in the other direction, and an operating leverpivoted on said rear base and connected to the other arm of said bellcrank whereby said carriage and rack bar may be lifted and lowered.

52. A jack comprising a horizontally extending fra-me, carryingwheels-supporting -said frame, a horizontally extending arm nected withsaid arm, a load supportingl member revolubly mounted on a vertical axison said lifting member, a lever mounted 0n said frame at a distance fromsaid lifting member, and operative connections between said lever andsaid arm for giving said arm a vertical swinging movement for carryingsaid load-supporting member upwardly with respect to said frame.

.53. A vehicle roller .jack comprising a horizontally extending frame,carrying wheels supporting said frame, a horizontally extending armpivotallymounted on one end portion of said frame, a lifting memberpivotally pconnected with said arm, a loadsupporting member revolublymounted on a vertical axis on said lifting member, power means mountedon said frame independently of said arm adapted by a plurality ofactuations to give the arm a step-by-step vertical swinging movement forcarrying saidloadsupporting member upwardly with respect to said frame,and means for holding said lifting member in vertical position on saidframe as the lifting member is moved upwardly by said arm.

54. A vehicle roller jack comprising a horizontally extending frame,carrying wheels supporting said frame, a load supporting memberrevolubly mounted on a vertical axis on said frame, a rod slidablelongitudinally ot said frame, means actuated by longitudinal movement ofsaid rod in one direction for raising said load supporting member withrespect to said frame, and power means mounted on said frame at adistance from said load supporting member adapted by a plurality ofoperative strokes to give said rod a step-by-step movement for raisingsaid load supporting member.

JUSEPH J. MlZER. WCTR JAKUB.

